. >> all right, our political correspondent. as always, thank you very much. >> u.s. president barack obama and his republican challenger for the white house mitt romney are back on the campaign trail with just five days to go until the election. >> some observers think obama's chances for reelection on november 6 may have gotten a boost from his handling of that monster storm, sandy. on that front, the cleanup effort is facing a number of challenges. >> u.s. oil company shell has confirmed, for instance, that the storm triggered an oil spill on a new jersey refinery, which is partly owned by shell, off the coast of new york city. there was at least one piece of good news for new yorkers today. >> some of new york's vital subway lines are up and running, like here below times square, but many subway tunnels are still flooded, and it is still not clear when full-service will return. especially hard hit, the brooklyn and manhattan connections and the financial district. but normal life is slowly starting to return to new york. >> i walked about 5 miles in total yesterda